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The non-classical MAP kinase ERK3 controls T cell activation.

Miriam Marquis1, Salix Boulet2, Simon Mathien3

  • 1Maisonneuve-Rosemont Hospital Research Centre, Montreal, Quebec, Canada ; Department of Microbiology, Infectiology and Immunology, University of Montreal, Quebec, Canada.

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The atypical mitogen-activated protein kinase (MAPK) ERK3 regulates T cell activation. ERK3-deficient T cells show reduced proliferation and impaired cytokine secretion, highlighting its crucial role in T cell responses.

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Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Classical mitogen-activated protein kinases (MAPKs) like ERK1 and ERK2 are key mediators of cellular responses to extracellular signals.
  • ERK3 is an atypical MAPK family member with high homology to ERK1/2, but its function in mature T cells remains largely uncharacterized.

Purpose of the Study:

  • To investigate the role of the atypical mitogen-activated protein kinase (MAPK) ERK3 in mature T cell activation.
  • To determine if ERK3 expression and function are regulated during T cell receptor (TCR)-mediated activation.

Main Methods:

  • Analysis of ERK3 expression in mouse T cells following T cell receptor (TCR) stimulation.
  • Assessment of ERK3 phosphorylation and association with MK5 in activated T cells.
  • Evaluation of T cell proliferation and cytokine secretion in ERK3-deficient T cells after anti-CD3 antibody stimulation.

Main Results:

  • ERK3 expression is induced in CD4+ and CD8+ T cells upon TCR activation, dependent on ERK1/2 activity.
  • Phosphorylated ERK3 associates with MK5 in activated primary T cells.
  • ERK3-deficient T cells exhibit decreased proliferation and impaired cytokine secretion upon TCR stimulation.

Conclusions:

  • The atypical MAPK ERK3 is a novel regulator of T cell activation.
  • ERK3 plays a significant role in TCR-induced T cell proliferation and cytokine production.